Distance from Center of King Pin to Front Set of Bolt Holes on a Reese Sidewinder Pin Box 5AB-E510-7  

Question:

Expert Reply:

Hey Gary,

According to my research, the Reese Sidewinder 5th Wheel King Pin with Rotating Turret RP77FR (5AB-E510-710) measures 18-3/4" from the center of the king pin to the front set of mounting holes.

That exact model isn't available anymore, but we have the Reese Sidewinder # RP77FR that will work in it's stead - this one just has multiple mounting holes so it can replace a variety of pin boxes.

Did you find an older model that you're wanting to fit to your 5th wheel, or are you in the market for a replacement?

expert reply by: Jon G

0

Gary G.

1/13/2025

I AM TRYING TO REPLACE A MORRYDE RPB72-1716 ON MY 2016 ARCTIC FOX 29.5T FITH WHEEL. NEEDS TO BE 12.5 IN. WIDE AND 20.5 IN FROM CENTER OF KING PIN TO CENTER OF FIRST SET OF MOUNTING HOLES. I WANT A AIR PIN BOX.

Jon G.

1/14/2025

@GaryG I checked the instructions and the Sidewinder # RP77FR is a direct replacement for your MORryde RPB72-1716 so you'll be good to go!

Gary G.

1/14/2025

@ CENTER OF KING PIN TO CENTER OF FRONT MOUNTING IN NOT 20.5 INCHES. IT IS TOO CLOSE.

Jon G.

1/14/2025

@GaryG This is the only replacement pin box for your 1716 model that also has an air bag built into it. If you're really strapped for something like turning clearance, you can utilize the pivoting pin box of the Sidewinder which moves the pivot point back 22" so even a truck with a 5-1/2' bed can safely tow without denting up the cab or busting out a window.